Definition: Given a 'poster' sentence and a corresponding 'response' (often, from Facebook or Reddit)classify the sentiment of the given response into four categories: 1) Positive, 2) Negative, 3) Neutral, and 4) Mixed if it contains both positive and negative.
Input: Poster: Obama admits Iran could cut nuclear breakout time 'almost down to zero' after Year 13 of possible agreement  Responser: Despicable and Treasonous!

Negative